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Finding the Fourth Proportional to 7,881.09, 11,821.05 and 4,372.80

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Solution

The fourth proportional to 7,881.09, 11,821.05 and 4,372.80 is: 6,558.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,881.09 : 11,821.05 = 4,372.80 : x
  2. Step 2: Convert to fraction form
    7,881.09/11,821.05 = 4,372.80/x
  3. Step 3: Cross multiply
    7,881.09x = 11,821.05 × 4,372.80
  4. Step 4: Simplify right side
    7,881.09x = 51,691,087.44
  5. Step 5: Solve for x
    x = 51,691,087.44/7,881.09
  6. Step 6: Final answer
    x = 6,558.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.